Strength deformation and water stability of jute fiber reinforced loess and its modified Duncan-Chang model
CHU Feng1*, ZHANG Dandong1, LUO Jingbo2, XU Chuanzhao2, WANG Xueyan1, YANG Tao1, HUANG Jiahao3, CHEN Yiran1
(1. College of Urban Planning and Municipal Engineering, Xi?an Polytechnic University, Xi?an, Shaanxi 710048, China; 2. China Jikan Research Institute of Engineering Investigations and Design Co., Ltd, Xi?an, Shaanxi 710043, China;
3. SinoHydro Bureau 3 Co., Ltd, Xi?an, Shaanxi 710024, China)
Abstract：Banana fibers were extracted from discarded banana pseudostems by removing impurities from the leaf sheath surfaces. These fibers were processed through carding and cutting operations to yield structured banana fiber reinforcements. The fibers, prepared at predefined lengths and mixing ratios, were incorporated into loess to create banana fiber-reinforced loess composites. A series of tests—including unconfined compressive strength tests, triaxial shear tests, drying shrinkage cracking tests, disintegration tests, and scanning electron microscopy (SEM) examinations—were conducted to systematically evaluate the effects of banana fiber reinforcement on the strength-deformation characteristics, crack resistance, and water stability of loess from both macro and microscopic perspectives. The experimental results indicated that both the unconfined compressive strength and shear stress of the fiber-reinforced loess significantly increased with longer fiber lengths and higher fiber content. The incorporation of fibers effectively mitigated shrinkage deformation and restricted crack development during drying. Optimal crack prevention was achieved with a fiber length of 15 mm and a fiber content of 0.7%, at which the crack area ratio and average crack width reached their minimum values. Moreover, the inclusion of banana fibers notably enhanced the water stability of loess, as evidenced by reduced average disintegration rates and amounts, as well as prolonged disintegration time. Under varying fiber contents, the stress-strain curves obtained from consolidated drained triaxial shear tests exhibited a consistent strain-hardening behavior, aligning well with the hyperbolic hypothesis of the Duncan-Chang model. By analyzing the correlations between reinforced and unreinforced loess model parameters, empirical equations accounting for fiber content effects were established. Based on these relationships, a modified Duncan-Chang E-B constitutive model incorporating the influence of fiber content was proposed. Comparisons between predicted and experimental curves confirmed the validity of the model.
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2026, Vol. 45 
